Enhance protocol and simulation features with activity tracking and behavior definitions

- Updated protocol documentation to include new `activity` and `activityLabel` fields in the person card response, reflecting real-time activity status.
- Introduced `BehaviorDef` to define behavior rules, including need thresholds and lesson skill gains, enhancing AI decision-making.
- Revised the `DefCatalog` to incorporate behavior definitions and updated validation logic to ensure proper behavior handling.
- Enhanced the simulation to manage presence and activity states, allowing for more dynamic interactions within the school environment.
- Updated tests to validate the new activity tracking and behavior functionalities, ensuring robust performance and reliability.
- Improved localization strings to support new activity and behavior features, enhancing user experience.

src/HSchool.Simulation/Components/PersonComponents.cs

@@ -22,6 +22,17 @@ public readonly record struct PersonTraits(IReadOnlyList<string> Ids);
 /// <summary>Live need values. The dictionary is mutated in place as the clock advances.</summary>
 public readonly record struct PersonNeeds(Dictionary<string, float> Values);
 
+/// <summary>
+/// The action this person is carrying out. Occupies <see cref="Thing"/> until it finishes.
+/// Idle when <see cref="ActionId"/> is null.
+/// </summary>
+public readonly record struct PersonActivity(string? ActionId, string? Thing, float RemainingMinutes)
+{
+    public static PersonActivity Idle { get; } = new(null, null, 0f);
+
+    public bool IsActive => ActionId is not null;
+}
+
 public readonly record struct PersonRoles(
     bool IsStudent,
     bool IsStaff,